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L4901A Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L4901A
Beschreibung DUAL 5V REGULATOR WITH RESET
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 10 Seiten
L4901A Datasheet, Funktion
® L4901A
DUAL 5V REGULATOR WITH RESET
. OUTPUT CURRENTS : I01 = 400mA
I0 2 = 400mA
. FIXED PRECISION OUTPUT VOLTAGE
5V ± 2%
. RESET FUNCTION CONTROLLED BY INPUT
VOLTAGE AND OUTPUT 1 VOLTAGE
. RESET FUNCTION EXTERNALLY PRO-
GRAMMABLE TIMING
. RESET OUTPUT LEVEL RELATED TO OUT-
PUT 2
. OUTPUT 2 INTERNALLY SWITCHED WITH
ACTIVE DISCHARGING
. LOW LEAKAGE CURRENT, LESS THAN 1µA
AT OUTPUT 1
. LOW QUIESCENT CURRENT (Input 1)
. INPUT OVERVOLTAGE PROTECTION UP TO
60V
. RESET OUTPUT HIGH
. OUTPUT TRANSISTORS SO A PROTECTION
. SHORT CIRCUIT AND THERMAL OVER-
LOAD PROTECTION
HEPTAWATT (Vertical)
(Plastic Package)
ORDERING NUMBER : L4901A
DESCRIPTION
The L4901A is a monolithic low drop dual 5V
regulator designed mainly for supplying microproc-
essor systems.
Reset and data save functions during switch on/off
can be realized.
PIN CONNECTION
June 2000
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L4901A Datasheet, Funktion
L4901A
inactive.
Figure 4 shows the L4901A with a back up battery
on the V01 output to maintain a CMOS time-of-day
clock and a stand by type N-MOS µP. The reset
output makes sure that the RAM is forced into the
low consumption stand by state, so the access to
memory is inhibit and the back up battery voltage
cannot drop so low that memory contents are cor-
rupted.
In this casethe main on-off switch disconnects both
regulators from the supply battery.
The L4901A is also ideal for microcomputer sys-
tems using battery backup CMOS static RAMs. As
shown in Figure 5 the reset output is used both to
Figure 4
Figure 5
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